煤矿地下水库对含不同赋存形态有机物及重金属矿井水净化效果研究

Purification effect of coal mine groundwater reservoir on mine water containing organic compounds and heavy metals in different occurrence forms

以神东矿区大柳塔煤矿在用的3座地下水库为研究对象,采集了3个进水、4个出水及1个裂隙水水样,通过对采集水样中有机物及其重金属含量测试,分析地下水库岩体对水体中的污染物的去除效果。研究结果表明,大柳塔煤矿地下水库采空区岩体组分中,黏土矿物含量约占35%,有较强的吸附能力。大柳塔煤矿地下水库系统对矿井水有较好的净化效果,出水悬浮物含量低于182mg/L,去除率可达80%~93%,能去除大量的悬浮物;出水COD含量小于35mg/L,去除率可达38%~61%,能去除部分COD;出水TOC含量在7.37~13.28 mg/L之间,去除率为19.1%~46.4%;分析表明颗粒态有机物可随悬浮颗粒物沉降而得到去除,而可溶性有机物可通过黏土矿物的吸附而得到去除。数据显示,进水中Fe和Mn各有99%和84%以上赋存于悬浮颗粒物上,经地下水库处理后,矿井水中Fe的去除率可达68%~100%,Mn的去除率可达75%~99%,表明地下水库针对赋存于悬浮颗粒物上的重金属可起到一定的去除作用。

The effective treatment of pollutants in the mine water by the fallen rock in the goaf has important practical significance for evaluating the underground reservoir technology,improving the comprehensive utilization of mine water and comprehensive utilization of coal gangue.In this paper,three underground water reservoirs in Daliuta Coal Mine in Shendong Mining Area are taken as research objects,and three influent samples,four effluent samples and one fissure water samples are collected.The removal of pollutants from water bodies in the underground reservoir of Daliuta Coal Mine is analyzed.The results show that the clay mineral content in the goaf of the underground reservoir of Daliuta Coal Mine accounts for about 35%of the clay mineral content and has a strong adsorption capacity.The underground water storage system of Daliuta Coal Mine has better purification effect on mine water.The suspended solids content of the effluent is lower than 182 mg/L,and the removal rate can reach 80%~93%.A large amount of suspended solids can be removed.The effluent COD content is less than 35 mg/L,the removal rate can reach 38%~61%,partial COD can be removed.The effluent TOC content is 7.37~13.28 mg/L,and the removal rate is 19.1%~46.4%.Analysis shows that the particulate organic matter can be removed with the sedimentation of suspended particles,and the soluble organic matter can be removed by the adsorption of clay minerals.Data display that 99%of Fe and 84%of Mn in the influent are present on suspended particulate matter.After treatment in the groundwater reservoir,the removal rate of Fe in the mine water can reach 68%~100%,and the removal rate of Mn can reach 75%~99%,indicating that the groundwater reservoir can play a certain role in removing heavy metals from suspended particulate matter.